The 2017 Toyota Tacomas in this analysis were driven mostly on the highway at an average speed of 60 miles per hour (about 85 percent of the miles driven). The rest of the miles were in the city (5 percent), in the suburbs (0 percent), and in heavy traffic (0 percent).

In addition, the average 2017 Toyota Tacoma in this analysis was driven on hilly terrain with a light foot and the AC not used at all.

The 4 cyl specifically for a truck is great. According to my computerized Scanguage I am getting a consistent 21-25 mpg per tank with all around driving and commuting. 21 gallong tank.
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I get 21mpg in the warm months and only 18mpg in the winter. I use the 4wd a lot when roads are snowy or slippery.
I had hoped for better gas mileage and find it ridiculous that there aren't better truck engines available from any of the manufacturers. A turbo-diesel four-cylinder would be much more practical in the Tacoma.
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I expected better fuel economy for a small truck. But none of the trucks get good economy. The manufacturers need to get with the program on truck fuel economy.
see full Toyota Tacoma review

Toyota Tacoma Gas Mileage (MPG)

Unlike other fuel economy surveys, TrueDelta's Real-World Gas Mileage Survey includes questions about how and
where a car was driven. So you can get an idea of the Toyota Tacoma's
real-world MPG based on how and where you drive a car.